vb6.0 Lesson
First, the algorithm
main features: there are poor, certainty, feasibility, input, output
Second, the structure of the order of
1, assignment statements
2, InputBox
. 3, MsgBox
. 4, Print
Third, the selection structure
(1) if condition then
statement. 1
the else
statement 2
End IF
(2) if condition then
statement. 1
ELSEIF condition then
statement 2
ELSEIF condition then
statements. 3
...
the else
statement
end if
(3) the SELECT case
the SELECT test case expression
case expression 1
sentence 1
case expression 2
statement 2
...
case the else
statement
end select
such as:
a=val(text1.text)
Select Case a
Case is = 100
Label1.Caption = "优"
Case is >= 80
Label1.Caption = "良"
Case is >= 60
Label1.Caption = "及格"
Case Else
Label1.Caption = "不及格"
End Select
Fourth, the loop structure
. 1, for
for loop variable initial value to a final value of step = step
loop
Exit of
Next loop variable
2, the For each Next
for each array element in the array or collection or collection
loop
Exit for
Next elements in the set or array
dim myctl as control
for each myctl in me.controls '遍历窗体中的控件
print myctl.name '在窗体中显示控件名称
next myctl
```
3、do loop
do while 条件
循环体
exit do
loop
当条件为真，执行循环体
4、do loop while
do
循环体
exit do
loop while 条件
当条件为真，跳出循环体（即终止循环）
5、do loop until
do
循环体
exit do
loop until 条件
当条件为真，跳出循环体（即终止循环）
6、 goto语句
goto 行号或标签
7、复用语句 with end with
with 对象
语句组
end with
如：
```vb
With Form1
.Caption = "程序设计"
.BackColor = vbRed
.Left = 1000
End With
. 8, Exit
(. 1) do Exit: to exit the "do Loop"
(2) Exit for
(. 3) Exit function
(. 4) Exit SU
(. 5) Exit property: immediate exit from the property in the process include statement.
9、end
（1）end
（2）end function、end if 、end select 、end sub、end type、end with、end property